From: Noble, TN (noble.pillai@gmail.com)
Date: Fri Oct 06 2006 - 06:39:53 ART
It is the switch that does the trusting part not the phone. As you mentioned
in the mail, the switch port trusts or set the CoS value of the traffic from
the PC (extended from phone) based on the interface config.
It is not necessary to have a trunk port for trusting the CoS valuses.
Thank you,
-Noble
On 10/6/06, Chee Chew Leong <cleong3@csc.com> wrote:
>
> As you know the PC connect to the phone is not a trunk port.
>
> The phone will set the CoS value from the PC traffic if we are using
>
> switchport priority extended cos cos_value
>
> If we would to trust the CoS value of the PC traffic by using
>
> switchport priority extended cos trust
>
> My question is how does this phone trust the CoS from the PC as the
> connection between phone and PC is not a trunk. I am a bit blurred on this
> part.
>
>
>
>
>
>
>
>
>
>
>
> "Roberto Fernandez" <rofernandez@us.telefonica.com>
> Sent by: nobody@groupstudy.com
> 09/30/2006 04:51 AM
> Please respond to
> "Roberto Fernandez" <rofernandez@us.telefonica.com>
>
>
> To
> "Tony Paterra" <apaterra@gmail.com>, "Cisco certification"
> <ccielab@groupstudy.com>
> cc
>
> Subject
> RE: switchport priority extend...
>
>
>
>
>
>
> Tony,
>
> It is definitely A.)
>
> Priority extend is an instruction the switch extends to the phone. The
> phone is the one who actually sets de CoS (anyone correct me if I'm
> wrong)
>
>
> Best Regards,
> Roberto
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Tony Paterra
> Sent: Friday, September 29, 2006 3:56 PM
> To: Cisco certification
> Subject: switchport priority extend...
>
> From reading the DocCD I'm not clear on what this command does...
>
> A.) It either trusts or overrides all traffic sent from a PC
> connected to the back of an IP Phone
>
> B.) It either trusts or overrides all traffic sent from a device
> connected to a switchport
>
> My gut tells me that it is B.) and all traffic entering that port (be
> it from an IP Phone or a PC) will be re-tagged or trusted.
>
> Thoughts?
>
> Thanks,
> --
> Tony Paterra
> apaterra@gmail.com
>
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